<template>
  <view class="cart-container" v-if="getCart.length > 0">
    <!-- 使用自定义的 address 组件 -->
    <my-address />

    <!-- 购物车商品列表的标题区域 -->
    <view class="cart-title">
      <!-- 左侧的图标 -->
      <uni-icons type="shop" size="18"></uni-icons>
      <!-- 描述文本 -->
      <text class="cart-title-text">购物车</text>
    </view>

    <!-- 商品列表区域 -->
    <!-- uni-swipe-action 是最外层包裹性质的容器 -->
    <uni-swipe-action>
      <block v-for="(goods, i) in getCart" :key="i">
        <uni-swipe-action-item
          :right-options="options"
          @click="swipeActionClickHandler(goods.goods_id)"
        >
          <!-- 在 radioChangeHandler 事件处理函数中，通过形参，得到商品的 goods_id 和 goods_state -->
          <my-goods
            :goods="goods"
            :show-radio="true"
            :show-num="true"
            @radio-change="radioChangeHandler"
            @num-change="numChangeHandler"
          ></my-goods>
        </uni-swipe-action-item>
      </block>
    </uni-swipe-action>

    <!-- 结算区域 -->
    <my-settle />
  </view>
  <view class="empty-cart" v-else>
    <image src="/static/cart_empty@2x.png" class="empty-img"></image>
    <text class="tip-text">空空如也~</text>
  </view>
</template>

<script>
// 导入自己封装的 mixin 模块
import badgeMix from '@/mixins/tabbar-badge.js'
import MyGoods from '@/components/my-goods'
import MyAddress from '@/components/my-address'
import MySettle from '@/components/my-settle'
import { mapGetters, mapMutations } from 'vuex'
export default {
  // 将 badgeMix 混入到当前的页面中进行使用
  mixins: [badgeMix],
  data () {
    return {
      options: [
        {
          text: '删除',
          style: {
            backgroundColor: '#c00000'
          }
        }
      ]
    }
  },
  computed: {
    ...mapGetters('m_cart', ['getCart'])
  },
  components: {
    MyGoods,
    MyAddress,
    MySettle
  },
  methods: {
    ...mapMutations('m_cart', [
      'updateGoodsState',
      'updateGoodsCount',
      'removeGoodsById'
    ]),
    // 商品的勾选状态发生了变化
    radioChangeHandler (goods) {
      this.updateGoodsState(goods)
    },
    // 商品数量发生了改变
    numChangeHandler (goods) {
      this.updateGoodsCount(goods)
    },
    // 点击了滑动操作按钮
    swipeActionClickHandler (goods_id) {
      this.removeGoodsById(goods_id)
    }
  }
}
</script>

<style lang="scss" scoped>
.cart-container {
  padding-bottom: 50px;
  .cart-title {
    height: 40px;
    display: flex;
    align-items: center;
    font-size: 14px;
    padding-left: 5px;
    border-bottom: 1px solid #efefef;
    .cart-title-text {
      margin-left: 10px;
    }
  }
}
.empty-cart {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 150px;

  .empty-img {
    width: 90px;
    height: 90px;
  }

  .tip-text {
    font-size: 12px;
    color: gray;
    margin-top: 15px;
  }
}
</style>
